/*
 * Created on Sep 18, 2012
 * Created by Paul Gardner
 * 
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License only.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

package org.gudy.azureus2.core3.util;

import java.util.Iterator;

import org.gudy.azureus2.core3.config.COConfigurationManager;

import com.aelitis.azureus.core.util.CopyOnWriteList;

public class AERunStateHandler {
    public static final long RS_DELAYED_UI = 0x00000001;
    public static final long RS_UDP_NET_ONLY = 0x00000002;
    public static final long RS_DHT_SLEEPING = 0x00000004;

    public static final long RS_ALL_ACTIVE = 0x00000000;
    public static final long RS_ALL_LOW = 0xffffffff;

    public static final long[] RS_MODES = { RS_DELAYED_UI, RS_UDP_NET_ONLY, RS_DHT_SLEEPING };

    public static final String[] RS_MODE_NAMES = { "dui: Delay UI Initialisation", "uno: UDP Network Only", "ds:  DHT Sleeping" };

    private static boolean start_low = COConfigurationManager.getBooleanParameter("Start In Low Resource Mode");

    private static long current_mode = start_low ? RS_ALL_LOW : RS_ALL_ACTIVE;

    private static AsyncDispatcher dispatcher = new AsyncDispatcher(2500);

    private static CopyOnWriteList<RunStateChangeListener> listeners = new CopyOnWriteList<RunStateChangeListener>();

    public static boolean isDelayedUI() {
        return ((current_mode & RS_DELAYED_UI) != 0);
    }

    public static boolean isUDPNetworkOnly() {
        return ((current_mode & RS_UDP_NET_ONLY) != 0);
    }

    public static boolean isDHTSleeping() {
        return ((current_mode & RS_DHT_SLEEPING) != 0);
    }

    public static long getResourceMode() {
        return (current_mode);
    }

    public static void setResourceMode(final long new_mode) {
        synchronized (dispatcher) {

            if (new_mode == current_mode) {

                return;
            }

            current_mode = new_mode;

            final Iterator<RunStateChangeListener> it = listeners.iterator();

            dispatcher.dispatch(new AERunnable() {
                public void runSupport() {
                    while (it.hasNext()) {

                        try {
                            it.next().runStateChanged(new_mode);

                        } catch (Throwable e) {

                            Debug.out(e);
                        }
                    }

                }
            });
        }
    }

    public static void addListener(final RunStateChangeListener l, boolean fire_now) {
        synchronized (dispatcher) {

            listeners.add(l);

            if (fire_now) {

                dispatcher.dispatch(new AERunnable() {
                    public void runSupport() {
                        try {
                            l.runStateChanged(current_mode);

                        } catch (Throwable e) {

                            Debug.out(e);
                        }
                    }
                });
            }
        }
    }

    public static void removeListener(RunStateChangeListener l) {
        synchronized (dispatcher) {

            listeners.remove(l);
        }
    }

    public interface RunStateChangeListener {
        public void runStateChanged(long run_state);
    }
}
